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Commit 83ca2594 authored by Dongli Zhang's avatar Dongli Zhang Committed by Konrad Rzeszutek Wilk
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swiotlb: dump used and total slots when swiotlb buffer is full 



So far the kernel only prints the requested size if swiotlb buffer if full.
It is not possible to know whether it is simply an out of buffer, or it is
because swiotlb cannot allocate buffer with the requested size due to
fragmentation.

As 'io_tlb_used' is available since commit 71602fe6 ("swiotlb: add
debugfs to track swiotlb buffer usage"), both 'io_tlb_used' and
'io_tlb_nslabs' are printed when swiotlb buffer is full.

Signed-off-by: default avatarDongli Zhang <dongli.zhang@oracle.com>
Signed-off-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
parent 22cb45d7

kernel/dma/swiotlb.c

+2 −1
Original line number Diff line number Diff line
@@ -533,7 +533,8 @@ phys_addr_t swiotlb_tbl_map_single(struct device *hwdev, 
not_found:

	spin_unlock_irqrestore(&io_tlb_lock, flags);

	if (!(attrs & DMA_ATTR_NO_WARN) && printk_ratelimit())

		dev_warn(hwdev, "swiotlb buffer is full (sz: %zd bytes)\n", size);

		dev_warn(hwdev, "swiotlb buffer is full (sz: %zd bytes), total %lu, used %lu\n",

			 size, io_tlb_nslabs, io_tlb_used);

	return DMA_MAPPING_ERROR;

found:

	io_tlb_used += nslots;